Battery for PartyBox Stage 520/720, Boombox 4 Portable Bluetooth Speaker

Battery for PartyBox Stage 520/720, Boombox 4 Portable Bluetooth Speaker

• 【Wide Compatibility & Perfect Fit】 This replacement battery is specifically engineered for seamless integration with the PartyBox 520/PartyBox 720 speaker, serving as a direct and fully functional substitute for the original FG2CELL21700 battery. It ensures uninterrupted power delivery, allowing your speaker to maintain its portability and high-performance audio quality for any occasion.
• 【Premium Specifications & Uncompromising Quality】 This lithium-ion battery delivers a consistent 21.6V output with a robust capacity of 4600mAh/99.36Wh, supported by a maximum charge voltage of 25.2V. Each unit is manufactured using premium-grade materials and multi-layer circuit board technology, guaranteeing stable energy output and long-term reliability under demanding usage conditions.
• 【Multi-Layer Safety & Extended Durability】 Prioritizing user safety, the battery incorporates an intelligent protection system that proactively monitors and prevents over-charging, over-discharging, short circuits, and excessive temperature fluctuations. This comprehensive approach not only ensures operational safety but also significantly enhances the battery’s service life, reducing the need for frequent replacements.
• 【Performance Optimization Guidelines】 To maximize the battery’s lifespan and efficiency, we advise performing three to five complete charge-discharge cycles during initial use. This practice helps calibrate the battery’s power management system, optimizing its capacity retention and ensuring extended runtime over the long term.
• 【Customer-Focused Service Assurance】 We back every battery with a 60-day return and replacement service and 24/7 customer support. If you require assistance, simply provide your order details, and our dedicated team will respond promptly to ensure a satisfactory resolution.